Avifauna refers to the birds collectively or defined by a specific region, habitat, or geological period.

Avifauna may also refer to:

• Vogelpark Avifauna, a large bird park in Alphen aan den Rijn, Netherlands

• The Avifauna of Laysan, a 1893 book by Lionel Walter Rothschild
• The Avifauna of British India and Its Dependencies, a major 19th-century work by James A. Murray (zoologist)
• The Avifauna of the Island of Ceylon. Bombay, an 1890 book by James A. Murray (zoologist)

• Fauna, the animals of a particular region or time
• Flora, the plants of a particular region or time
• Lists of birds, index of avifauna by region
• Megafauna, large animals of a particular region or time